Holding Tank Monitoring System

<h1>Holding Tank Monitoring System</h1>
<img src="measure.jpg">
<h2>Overview</h2>
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- Laser sensor mounted on inside lid of holding tank to measure level.
- Email alert on high or low level.
- Webapp displays level.
- Replaceable AA batteries with 10 year life.
- BLE/wifi gateway sends info to monitoring server or directly to you via your wifi router.
- One button press to setup gateway and QR code scan to setup sensor app.
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<img src="app1.jpg" style="border:5px solid #000000"> 
<img src="app2.jpg" style="border:5px solid #000000"> 
<img src="app3.jpg" style="border:5px solid #000000">
<br>Above are screen shots of the WebApp that works on all devices.
<br>Optionally Install <a href="measure.apk">Android</a> Measure App for getting sensor readings directly.<br>
<h2>Basic Installation</h2>
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App
- Scan QR code supplied with phone.
- Add website to home screen to install webapp.
- Go to Setup screen and fill in parameters and save.
Gateway
- Press WPS button on your wifi router.
- Plug gateway into power within 50 feet of sensor and router.
Sensor
- Install sensor on underside of holding tank lid with window point to target.
- Optionally mount sensor on side wall using bracket.
- Measure high and low levels in centimeters and enter into app.
- Place magnet near sensor window for 10 seconds to send test measurement.
- Refresh app screen to see measurement.
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<a href="manual.txt">View Manual</a>
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<h2>Frequently Asked Questions</h2>
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Q: What is the measurement range?
A: 10 to 200cm.

Q: What is the URL of the WebApp?
A: https://gorko.ca/measure/, for login screen or 
   https://gorko.ca/measure/?addr=X&pass=P, for auto login. 
   X is the address of your sensor. P is password

Q: What kind of batteries are used and how long do they last?
A: Alkaline AA will last 5 years. Lithium AA will last 10 years.

Q: Why is the reading of the level incorrect?
A: You have dirt/frost on the sensor window. Wipe it off with a damp cloth.

Q: Why do I get a No Report message or no updates?
A: The sensor is too far from the gateway. Move the gateway closer.

Q: Do I need to use a password?
A: No. There is no sensitive data.
   If you want to use a password, you must also set one up on the gateway.

Q: How long does it take to install?
A: It take between 15 and 60 minutes to install.
   A Phillips screw driver, tape measure, and magnet are required for tools.

Q: How often are the measurements updated?
A: The sensor sends a measurement every 10 minutes and the gateway every hour.
   Advanced gateway setting can send quicker, but that is not required.
   The sensor will send every second when a magnet is place near the window.
   This will run down the battery quickly.

Q: What is the operating temperature?
A: -30C to +50C. Battery life will be less at lower temperatures.

Q: Will the sensor or gateway corrode?
A: The sensor is sealled from the elements. It will even survive a short drop in the tank.
   The gateway is intended to operate indoors. It can be placed in sealed plastic box for outdoor use.

Q: What is the warranty?
A: 1 Year from manufacturing defects. Abuse is not covered.

Q: How far can the gateway be from the sensor and router?
A: About 50 feet from gateway to sensor and router.


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